Magnatone vibrato

After acquainting myself with the sound of the Magnatone amps' "true vibrato" (which is awesome, by the way), I couldn't help but feel like I had heard it before. Like, in power pop or alternative music. My suspicion is that the musicians had either bought one- because, you know, lesser known vintage tube amps = rock cred- or that it was sitting around in the studio and they decided to play with it. There are two bands I can name that I'm pretty certain use it in their recordings: Letters to Cleo and Puffy AmiYumi. It's that distinctly wobbly sound that I'm thinking of...